Pulp-beater.



' S. MITCHELL.

Sept 3, 1918;

Patehted ATTORNEYS SIDNEY MITCHELL, 0F NEW'YOBK, N. Y.

PULP-BEATER.

Specificatioters Patent. Patented Sept. 3, 1918- Application filed February 7, 1918. Serial No. 215,771.

To all whom it may concern:

Be it known that I, SIDNEY Mi'rGHELL, a citizen of the United States, residing at New York. in'the county of New York and State of New York, have invented certain new and useful Improvements in Pulp- Beaters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which forma part of this specification.

The present invention relates, generally, to improvements in pulp beating machines commonly employed in the paper manufacturing industry; and the invention has reference, more particularly, to an improved construction of beater. or breaker adapted to beat and tease out the fibers of the raw material to produce a proper pulp requisite to the carrying on of paper manufacture.

The invention has for its principal object to'providc a means in connection. with the beater mechanism 'for separating and discharging such portions of the raw material as has been pr perly beaten out or pulped, .while still retaining that portion of the same, subject to the further action of the beater mechanism, which requires further treatment to reduce the same to the proper beaten or pulped condition, thus rendering the operation of the machine more or less continuous in its discharge of pulp, and elin'iinat-ing the necessity of working over and over that portion of the raw material which has been properly reduced while awaiting the reduction of the more re sistant portions of the same, thereby saving both timeand energy.

The invention has for a further object to provide a novel arrangement of means for automatically separating reduced pulp from unreduccd pulp, so related to the beater mechanism that the reduced pulp is discharged from the beater while the unreduced pulp is returned to the same, such separating arrangement being of a character which is positively free from any liability to clogging or obstruction.

Other objects of the present invention, not at this time more particularly enumerated, will be clearly understood from the following detailed description of the same.

Ilia invention sonsists,priinarily, iii-the novel construction of beater or breaker hereinafter set forth; and the invention consists, furthermore, in the novel arrangements and combinations of the various devices and parts, as well as in the details of the construction of the said parts, all of which will be hereinafter more fully described, and then finally defined in the appended claims. The invention is clearly illustrated-in the accompanying drawings, in which t Figure l is a plan view of a beater mechanism made'according to and embodying the principles of my present invention, a portion of the hood inclosmg the beater roll being broken away.

Fig. 2 is a vertical longitudinal section of the same, taken on line 2-2 in said Fig. 1.

Fig. 3 is a detail vertical longitudinal section of the water-screen box forming a portion of the pulp separating devices.

Similar characters of references are employed in all of the hcreinabove described views, to indicate corresponding parts.

Referring now to the said drawings, the reference character 1 indicates the usual beater tub in which the beater mechanism and the novel separating devices are mounted, and in which the raw material .to be p'ulped and the water for softening the same, and assisting its circulation around the tub to the beater roll, is received. rranged within the tub is the usual mid feather 2 which terminates short of each end of thefiub, and which serves to prop-- crly divide the tub to provide the desired continuous circulatory passage therein. Mounted between one side wall of said tub and said mid-feather 2 is the usual beater roll 3, having thescries of radiallv projecting fly-bars 4 on its circumference. A transversely journaled driving shaft 5 is mounted in connection with said tub upon which the roll? is fixed, said shaft being provided with a suitable belt pulley (3, or othcr suitable means for driving the same. Arranged beneath said beater roll 3 is any desired form of base-plate 7, with whichthe beater roll cooperates in beating out the raw material into the required pulp. Extending over the exposed upper portion of the beater roll 3 is an inc-losing hood 8, having aportionsubstantially concentric to the circumference of the beater roll 8 in which is provided a transverse discharge opening 110 9. Arrangedexteriorly in front of anti beneath said dlscharge opening 9 s a Cl1S- charge opening 9, is a. header member 12 of a Water-screen device. I One end of said header member 12 pro ects. exteriorly through the side of said hood 8, and is provided with an interiorly threaded portion 13 into which is screwed the end of a water supply pipe 14 leading from any suitable source of supply. Connected with the bottomwall of said header member 12'are one or more rows of downwardly directed water discharge nozzles. Preferably the said 11oz zles are arranged to provide a front row of nozzles 15, obliquely inclined to the right to discharge a plurality of downwardly di,- rected obliquely inclined water streams 16, and a rear row of nozzles 17 obliquely in clined to the left to discharge a plurality of downwardly directed oppositely obliquely inclined Water streams 18. The said streams 16 and 18 are discharged between the discharge opening 9 and the beater roll 3, and form a water screen or curtain having free unobstructed interstices 19 between same. The water supplied to the header, is preferably under suflicient pressure to lend considerable force to the streams discharged therefrom, so that they maintain their direction, and also are of sufficient strength to obstruct the passage of material therethrough not sufficiently pulped, While the interstices 19 are of sufiicient size to permit the passage therethrough of pulped material properly reduced *tothe fibrous condition desired.

In operating the device the tub 1 is filled with water, and the raw material to be pulped is deposited'therein. The beater roll 3 is then set in motion. The rotation of the beater roll acts a paddle upon the waterin the tub, causing the same to circulate around the tub in the path defined by the wallsof the tub and the midfeather 2. The circulatory flow ofthe water thus set upcarries the rawmaterial between the beater roll and the base plate 7 in the usual manner, thereby causing the reduction of the raw material into fibrous mass, which with the water in which it is harried produces the pulp desired. Thenz'iturc of the raw material is such .that almost immediately some portions thereof are reduced to the necessary pulpy mass, while other portions, being more resistant, are 'not soredueed until, during the circulation through the tub they are carried many times into contact with the beater roll. In most constructions of heaters, as heretofore used, it

is necessary to permit the properly reduced portions of the raw material to continue in. circulation with the rest of the mass until the whole batch is entirely reduced. This necessity entails both. a loss of time and energy. With my construction of novel separating in, ins in combination with the beater proper, however, the properly reduced or pulped portions of the raw material are, in large part, separated from the more resistant mass and discharged continuously from the'hood ready for use, leaving the more reflying portions of the pulp are precipitated toward the water screen and passing through the interstices 19 between the streams 16 and 18, are received in the trough 10, being thence discharged from the beater machine. If any raw material not properly reduced, strings, rags, or other non-pulpcd material are thrown oil by the beater roll. the same being too coarse to pass through the interstices 19 between the streams, they are caught by. the force of the downwardly discharged streams and carried therewith hack into the tub, I, so as to be further subjected to the beating action of the beater-roll. The streams of'watcr ll} and 11% have suliicieut force to provide the necessary obstzu'lc to the passage through the disclmrge, opening 9 of material roo coarse. and cmiscqucntly not suiiicicntly reduced or pulped to be ready for discharge, and yet the greater por-.

tion of pulp which is beaten to a line enough degree readily flies through the interstices 19 between the water streams without being engaged by, the latter so as to be washed back into the tub l. The water screen thus provides a very practical separating dci'ice, which is positive and powerful enough to obstruct the outward passa o'z' coarse unreduced raw material, and yet because of its character, being composed of moving streams of water, cannot p ssibly clog up or become obstructed.

lVhile it is preferable to employ two sets of streams crossing each other obliquely, I do not wish to 'be understood as limiting myself entirely to such an :urrangzfcmcnt, since it is'possible to use even a single or'd oulilc row of vertically descending streams ell'cc amaze the of raw material circulating in the tub, the more resistant portions of the said raw mate ial will thereupon have opportunity for more intimate contact with the beater roll, thus assuring a more rapid re duction of the same, 'ith a consequent furthcr saving of time and energy.

i am aware that some changes may be made in the general arrangements and combinations of the devices and parts, as Well as'in the details of the construction of the same, without departing from the scope of my invention as described in the foregoing specification, and as defined in the claims appended hereto. Hence, I do not limit my invention to the exact arrangements and combinations of the devices and parts as set forth in the foregoing specification, nor do 1' confine myself to the-exact details of the construction of said parts as illustrated in the accompanying drawings.

I claim 1. in a device of the kind described, a tub. a heater roll therein. a hood inclosing said heater roll haying a discharge opening therein, a trouglnexthriorly arranged relative to said discharge opening, and means a'djm-cnt to said discharge opening for projecting a plurality of laterally spaced streams of .titQl' down ardly across said discharge opening to provide a water screen ijhr the purposes described.

2. In a device of the kind described, a tub, a beaterroll therein, a hood inclosing said beater roll having a discharge opening therein, a trough extcriorly arranged relative to said discharge opening, a Water discharging means disposed transversely withinsaid hood above said discharge opening, means for delivering Water to said water discharging means, the latter being adapted to project aplurality of downwardly .dirccicd closely spaced streams of water across said discharge opening to form a water screen bctnccu said heate roll and said opening.

3. In a device of the kind described, a tub. a beater roll therein, a hood inclosing said beater roll having a. transverse discharge opening therein, a receiving trough extcriorly disposed beneath and in front of said discharge opening, a header niciubcr secured within said hood above said dis-- charge opening, means for delivering wateru'ndcr pressure to said header member. and means connected with the under side of said header rnembcnfor discharging a plurality oi downwardly directed closely spaced .streams of water between said discharge opening and said beater roll to provide a pulp separating water screen.

4. In a device of the kind described, a tub, a heater roll therein, a hood inclosing. said beater roll having a transverse discharge opening therein, a receiving trough .exteriorly disposed beneath and in front of,

said discharge opening, a header member secured within said hood above said discharge opening, means for delivering water under. pressure to said header member, a transverse row of dischargenozzles connected with said header member. the same being obliquely disposed in one direction to discl'i'arge a plurality of downwardly dircctcd obliquely inclined streams of Water betiveen said discharge opening and said heater roll to provide a pulp separating water screen.

In a device of the kind described, a. v tub. a heater roll therein, a hood inclosing said heater roll having a transverse discharge opening therein, a receiving trough cxteriorly disposed beneath. and in front of said discharge opening, a header member secured within said hood above said discharge 35 openin nieans for delivering water under pressure to said header member, a trans: verse row of discharge nozzles connected with said header member, the same being obliquely disposed in one direction to dis- 0 charge a plurality, of downwardly directed obliquely inclined streams of water, a second parallel transverse row of discharge nozzles connected vith the header member, the same being obliquelydisposed in an oppo- $5 site direction to discharge a plurality of downwardly directed oppositely inclined streams of water, said streams thus 'crossin each other to provide interstices throng which properly reduced pulp thrown from said beater roll by centrifugal force may passso as to be ejected through said discharge opcning into said receiving trough. 6.111 a device of th kind described, a tub. a beater roll therein, a hood inc-losing said banter roll having-a discharge opening therein. a trough cxtcriorly arranged relalVi tn esses v Gnonci D. RICHARDS, Mrrcirnnn Tom). 

